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What is an ultrasound fingerprint scanner and why is it needed?

In short: an ultrasound scanner creates a three-dimensional model of a print using sound waves reflected from the surface of a finger. It is much more reliable than the optical sensor and works, even if the fingers are greasy, dirty or wet.

The use of sound waves gives this type of scanner a significant advantage over the optical one and in accuracy and speed of operation.

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What biometric protection is in a smartphone?

Modern smartphones almost got rid of the framework. Many people liked the full-screen design, but the engineers faced a new challenge: how to make biometric protection comfortable and reliable?

Passwords are no longer an option - no one else would like to manually enter complex combinations each time they unlock. Five years ago, capacitive fingerprint readers began to appear massively in smartphones, and later face recognition and an iris scanner were added to them. However, there is nothing easier than unlocking your smartphone with your finger.

Where can I place a fingerprint scanner in a frameless smartphone?

If you need to place a fingerprint scanner on the front panel of the frameless, then there is only one way out - put it under the glass. Many manufacturers do this: for example, Vivo and OnePlus use optical display scanners, but their drawbacks are slow finger recognition, unreliability and impracticality. In cold weather, if your finger gets wet or gets dirty, the optical scanner refuses to work. Of course, it is very uncomfortable. But if consumers want something, there will always be companies willing to meet demand.

Thanks to the joint efforts of Qualcomm and Samsung , the Galaxy S10 implemented a safe and reliable new type of scanner. It is built right into the smartphone screen, does not take away the working space on the display and is not felt to the touch. The module emits sound waves, catches their reflection and builds a finger map on this basis. This is the ultrasound scanner prints.

How does an ultrasound scanner work?

The surface of the finger is not perfectly flat, as it may seem: there is a thin papillary pattern of combs, depressions and pores on the skin, and blood vessels pass under the skin close to its surface. Together they form a unique pattern that is not repeated even on the fingers of the same person.

The scanner remembers the pattern. When you try to unlock the smartphone, he checks the finger with the image in memory. If the pictures are the same, the user gets access to the device.

The ultrasound scanner is convenient and fast, but what's even nicer is that it recognizes your finger, even if you just held a fat piece of pizza. He can not fool a high-quality photo. Dirt does not hurt his work: for sound waves, a small amount of water or fat is not a barrier at all. These are features that are beyond the power of capacitive modules.

Source: www.androidcentral.com

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